Mysql中int sum=(int)(long)com.ExecuteScalar(); 为什么好先转为long再int??
MySqlCommand com=new MySqlCommand("SELECT COUNT(*) from student",conn);
int sum=(int)(long)com.ExecuteScalar();
Mysql中int sum=(int)(long)com.ExecuteScalar(); 为什么好先转为long再int??
MySqlCommand com=new MySqlCommand("SELECT COUNT(*) from student",conn);
int sum=(int)(long)com.ExecuteScalar();